Before making a final decision of
having your iPhone 4 unlock
and continue using
the device, it is wise to run a series of tests in order to check the
ability and performance of such device. Perhaps, you are planning to
get an unlocked device, remember how iPhone users take a trip to the
Apple service centers only to get some additional troubleshooting and
support. Therefore, these series of tests will allow you to come up
with a decision whether or not have the device replaced, else, have
it unlocked in order to go on using the device and enjoy its features
and performance. These tests include the iPhone’s signal strength,
data connection, audio quality, and not to mention the battery life.
Do not immediately upgrade your device to an iPhone 4S and look for ways on how to unlock iPhone 4S,
instead keep your iPhone 4 and check should the signal strength is
high or not. In order to test the signal strength, you need to access
the “Phone” application and dial, *3001#12345#*
then you tap the “Call” button. This should be able to create a
call and as the call is being made, the signal bars will be replaced
with a number. Leaving this application field, you can only tap on
the “Home” button once and it will exit automatically.